Sharpener for knives



(No Model.)

i 0. K. BRADFORD.

SHARPBNERFOR KNIVES, &c.

No. 501,267. Patented July 11, 1893.

- C/wcrZes Zlfiracifari.

UNITED STATES PATENT OFFICE.

CHARLES KEMPTON BRADFORD; OF LYNNFIELD, MASSACHUSETTS.

SHARPENER Fo'R KNIVES, 80C.

SPECIFICATION forming part of Letters Patent No. 501,267, dated July 111893.

Application filed July 7, 1892- Serial No.439,221. (No model.)

To ail whom it may concern:

Be it known that I, CHARLES KEMPTON BRADFORD, of Lynnfield, in thecounty of Essex and State of Massachusetts, have invented an ImprovedUniversal and Reversible Sharpener for Knives, Scissors, and LikeArticles, of which the following is a specification, reference being badto the accompanying drawings, in which-- Figure 1 is a plan, and Fig. 2a perspective of my improved sharpener. Fig. 3 is a section on line 44of Fig. 2. Fig. 4 illustrates the disk used.

My invention relates to that class of sharpening devices in which twocutting edges are held adjacent in a suitable support and between whichthe blade of a knife or the like is drawn to be sharpened.

The invention has for its object to produce a device which may be usedfor a much greater length of time than those heretofore made and whichwill accomplish the purpose intended in a more efficient manner than.

heretofore.

In the drawings in which I have shown the best form of my invention Arepresents a supporting piece which is centrally bent as shown andformed in two upwardly extended arms a. a secured to the base 0t so asto lean outwardly. Upon the arms a a are secured the sharpening disks B,O, which are grooved in their peripheries to form four cutting edges 1)c b c. The disks when secured in place will be disposed obliquely, owingto the bend in the supporting piece A and inclined out from the base asdescribed. It is desired that the cutting edges of the disk shouldoverlap, and to effect this I use washer a between arm a.- and disk 0,and washer 0, between disk B and a backing piece D which is bent toconform to the angle of the disks and has the slit d to form a guide forthe article to be sharpened. It will be observed that this arrangementpermits one edge of one disk to be between the two edges of the other sothat in use only the two inner edges of the disk vto be sharpened.

engage the article to be sharpened. The backing piece D has twoprojections d d one of which is provided with a cutting edge (1 tofurnish a thread cutter, the other (1 serving as a guide when scissorsare to be sharpened.

The device having been secured'upon a desirable rest, a blade isinserted in slit d with the edge between the disks and drawn throughagainst the edges in a direction from the base 0. until properlysharpened. of the invention will now be readily understood. The disksbeing arranged to lean outwardly from the base in one directionin whichthe blade is drawn, greatly facilitates its smooth travel while if theywere perpendicular the blade would often jump and stickimpairing theedge to a great degree. The grooves in the disks provide two cuttingedges for each so that they may be reversed when dulled and new edgesexposed to the article to be sharpened, the inclination of the diskspermitting but oneedge of each to come into contact with the knife bladeor other article The cutting edges being The advantages circular mayberevolved as they become worn, so that the device is both reversible anduniversal in its use.

' I claim as my invention 1. In a sharpener two disks, B, 0, eachgrooved about its periphery to form circular cutting edges b, c,- and bc relatively disposed to form an angle, and with one cutting edge of onebetween the two cutting edges of the other, substantially as described.

2. The improved sharpener comprising cutting disks disposed outwardly atan angle and inclined from the base, a groove upon the periphery of eachto form two cutting edges one edge of one disk lying between two edgesof the other, and a brace for holding them, substantially as described.

CHARLES KEMPTON BRADFORD.

Witnesses:

JONATHAN CILLEY, JoHN'R. SNOW.

